Bone Marrow is tissue in the hollow centers of our bones, it has stem cells which produce our blood cells. It also produces red blood cells that give oxygen to the whole body. Hope this helped : )
I think the best answer is D.
The answer is 25%.
Father : Aa
Mather : Aa
Offspring : AA : Aa : aa = 1 : 2 : 1
Recessive : 1/4 = 25%
